PowerShell Replace number in string

Question

I\'m not such a regex expert and frankly I\'m trying to avoid it whenever I can.

I would like to create a new $String where the number wit

Answer 1

Another option is using the Replace() method of the Regex class with a scriptblock (code taken from this answer by Roman Kuzmin):

$callback = {
  $v = [int]$args[0].Groups[1].Value
  $args[0] -replace $v,++$v
}

$filename = "\\Server\c$\share_1\share2_\Taget2[1] - 2014-07-29.log"

$re = [Regex]"\[(\d+)\]"
$re.Replace($filename, $callback)

Existing files could be handled like this:

...
$re = [Regex]"\[(\d+)\]"
while (Test-Path -LiteralPath $filename) {
  $filename = $re.Replace($filename, $callback)
}

Note that you must use Test-Path with the parameter -LiteralPath here, because your filename contains square brackets, which would otherwise be interpreted as wildcard characters.